Goals : less tampering and lowest average kw unit price

So my goal is to tamper less with settings, to keep things simple that if something happened to me my family could just leave it all alone unless an error appeared. But to also keep my average price per kw as low as possible, I think I might be there but interested to see what you lot think!

Plan, leave my GE system set to charge the battery to 100% every night 365 days a year. Future EV is set to boost charge from the grid during the same charge slot as the GE battery preventing home battery drain. PV > Home, then PV > EV when surplus over 1.4kw, then PV > GE battery when sub 1.4kw surplus and if the car is charged or not plugged in. Current charge price per kw is 5.5p and export is 4.1p.

Home setup (will be soon) 5.7kw East facing PV, 4.6kw West Facing PV. ASHP, everything in the home is electric. GE AC3 with 8.2kw battery. Zappi 2 7kw charger. ID.3 58kw (from July)

Am I there? My winter average has been 8.8p per kw. Summer should end up being minus something. Yearly average could work out around 0p per kw.

Thoughts please 😄

THALL ive done this tactic since late 2020. 5p import 5p export so no worries about "is the solar charge calc right today"
Works well. Does look like you consume a lot when you see your bills but then you use the SEG to pay off a lot of it so balances out.

hoggy Well if it all works out I am saving £1200 - £1500 per year on house electric and soon will be saving over £2000 per year on petrol all with next to no user input. All I should need to do is the occasional manual boost to put some charge in the car. This all seems like a no brainer for anyone to do. PV, Home storage, EV. Setup and leave it.

Depends on your setup to an extent, those of us with hybrid inverters can negate the losses involved in transforming as its just rectification on the DC to DC side. Or a bit shorter, it's more efficient to charge the battery using the PV.

I've dropped my battery to 75% SoC overnight with odd occasions where I've reset it to 100% since the start of Feb. Ideally chasing automation to optimise as far as possible as my SEG is 4p Vs Go of 5p but with a healthy battery buffer.

That said today looks like my first day since install (had an old mechanical meter running backwards for a while) that my 9.2kwh import including standing charge will cost me nothing. Not to mention the 2 loads of washing, over 2kwh of hot water heating etc.

I could potentially go down a 6kwp north facing array and just sell it all back to the grid in summer coupled with another battery which would I suspect would see me on a cost neutral bill for the year overall. That said it's another 11k and the payback is around £700 a year at current rates for that install and 15.7 years.

We are going to be in the house that long so it's an option potentially but I do need some very accurate modelling to work it all out.

It also depends on your PV size and whether you're paid for export.  I have only 2kW of PV on an early FIT, so I aim to minimise export (as it's deemed at 50%); I don't really have roof space for more PV.  I'm on GoFaster 3H at present, and mostly charge to 100%.   I have a Python script that predicts tomorrow's PV gen (based on Solcast, adjusted to make it more pessimistic) - if it looks sunny, the charge target is reduced (using GivTCP local API - AC3 with 8.2 battery)

We have gas CH and HW (also solar HW), so I haven't seen the need to divert to the immersion heater - the battery currently normally has space for charge when the sun's out.   Might review that when I know what our next tariff is though! (We don't have an EV yet, so unsure what tariff we'll be on once it comes up for renewal)